Dish-washing machine



Nby 21, 1940. T. E. D. BILDE nIsH-wAsHING MACHINE Filed Nov. 24, 1957 s `sheets-Sheet 1 'Ils May 2l, 1940. T. E. D. BILDE DISH-WASHING MAHINE 3 Sheets-Sheet 2 Filed Nov. 24, 1937 MaS'I-Z 1940I l T. E. D. BILDE 2,201,284

DISH-WASHING MACHINE Filed Nov. 24, 1937 s sheets-sheet 5 Patented May 21, 1940 PATENT OFFICE DISH-WASHING MACHINE Tord Erik Daniel Bilde,'Stockl1olm, Sweden, assignor to Bolinders Fabriks Aktlebolag, Stockholm, Sweden, a corporation of Sweden Application November 24, 1937, Serial No. 176,383 In Sweden November 30, 1936 6 Claims.

The present invention relates to dish-washing machines, especially for domestic purposes,

having two' tanks, one for washing liquid and the other for rinsing liquid, and more particularlyto dish-washing machines of this type having separate spraying systems for the washing and vrinsing liquids; each system comprising one of said tanks and a pump.

The principal object of the invention is to proaccording as the following description proceeds,

reference being.had to the accompanying draw-` ings in which an embodiment of the invention is illustrated by Way of example.

In the drawings:

vFigure 1 is a perspective phantom view of a dish-washing machine according to the invention;

Fig. 2 is a side view of the -lower portion of the machine on an enlarged scale;

Fig. 3 is a, vertical sectional view along the line 3-3` in Figs. 2 and 5;

Fig. 4 is a plan view of the lower portion of the machine; Fig. 5 is also a plan view of saidlower portion, the spraying devices as well as a partition forming the bottom of the spraying compartment being omitted;

Fig. 6 is a sectional view on an enlarged scale of a nozzle for rinsing liquid; and

Fig. 7 is a sectional view on an enlarged scale of a suction valve of the washing liquid pump.

With reference especially to Fig. 1, reference numeral I0 designates a casing enclosing the dish-washing machine and having substantially they form of a right-angled parallelepiped with a door II and four feet I2. The two spraying systems of the machine for washing liquid and rinsing liquid are in their entirely located in the lower portion of the machine casing, whereas the upper portion thereof forms a spraying compartment. A basket or the like supporting the dishes and introduced on guides I3 into said 55 spraying compartment will be ysprayed exclusively from below with washing liquid as well as with rinsing liquid.

The spraying systems comprise each a motor driven pump, a liquid tank and a spraying device. As shown especially in Figures 1 and 5, the two tanks for washing and rinsing liquid form part of a common receptacle of substantially parallelepipedic shape but for two lateral wings 21 and 28. An inclined partition I5 extends from a horizontalI top border I1 along the front edge of the receptacle towards the bottom of the wing 21, said partition being welded to the lefthand side' wall of the receptacle, and another inclined partition IB extends from the horizontal top border I1 along the right-hand edge of the receptacle towards the bottom of the wing 21, said partition being welded to the rear side wall` of the receptacle. The two partitions I5,` IB are welded to each other along a contiguous edge I4. By these partitions I5, I6 an open washing tank I8 is formed by side and bottom walls of wing 21, partitions I5, I6 and part of left-hand and rear side walls of the receptacle and a closed rinsing tank 20 by top, side and bottom walls of wing 28, partitions I5, I6, borders I1, I1 front and right-hand side walls and part of left-hand and rear side walls of the receptacle and bottom Wall thereof. Thus, the partitions I5, I6 form bottom wall of the washing tank I8 and top wall of the rinsing tank 20. By building together the two tanks in this maner a compact design is obtained and further it is'possible during a relatively long time to maintain the temperature of the warm liquid, usually water, within the two tanks due to the heat transmitting surface being reduced to a minimum. Provided in the bottom wall of wing 21 of the washing tank I8 is an outlet I9 and i'n the bottom wall of wing 28 of 'the rinsing tank 20 an outlet 23. On account of the inclination of the partition I5, I6 the washing liquid gets a favorable flow towards the washing pump. The outlets I9 and 23 are ar` ranged at places where the depth ot liquid in the respective tarik is greatest facilitating the charging of the pumps. The rinsing tank 20 has a charging opening 22, or preferably such an opening is arranged on each side of the machine (Fig. 4) to permit conectionby shortest possible conduit with a domestic water conduit disposed at right-hand or left-hand side thereof. Another opening 2| is provided in the top border I1 of the rinsing tank 20, said opening serving as over-flow to the washing tank I8. Conse- 1 quently, the rinsing tank 201s wholly closed but for the over-now 2|, one or more charging openings 22 and the outlet 23 tothe suction conduit of the pump. Thereby the advantage is gained that the rinsing liquid becomes wholly insulated and, thus, free from impurities and infectious matter. f

The opening 2| may be covered by a disk 38 resting loosely on the borders thereof and guided therein by guiding pins 39 (see Figs. 4 and 5). This disk represents a safety means to eliminate any possibility of communication in the direction from the washing tank to the rinsing tank which is of importance to attain a hygienic washing.

The housing 26 o f an electric motor and the housings and 26 ofthe washing and rinsing pumps located one on either side of the motor are, as shown, built together to form a unit disposed between the wings21 and 28 of the washing tank i8' and therlnsing tank 29, respectively. By providing the tanks with such projecting Wings which is rendered possible by the tanks being built together in the above said manner a symmetric' and simple connection of said tanks A with the motor pump` unit is obtained in the following manner. i

Communicating with a central inlet opening of each pump is rigid conduit 30 and 3|, respectively, iixed`to the motor pump unit and having its free opening connected to the outlet i9 or 23 at the bottom of the wing 21 or 28, respectively. In this manner these wings form partof the suction conduity of the 'respective pump. Communicating with a peripheral outlet of the washing pump is a pipe 32 communicating with the spraying device AIfor washingliquid kwhich latter is shown to comprise a spray pipe 33 swinging to and fro and having outlet holes `34. Communicating with a peripheral outlet of the rinsing pump is a pipe 35 communicating with the spraying device for rinsing liquid which latter is shown to comprise a stationary forkshaped spray pipe 38 having outlet nozzles 31.

At their lowest point the pumps are each provided with an outlet pipe 4|) and di, respectively, n

which pipes are connected with a common discharge pipe 62. Communicating with said discharge pipe i2 is also an overflow pipe Q3 extending from the top of the washing tank. The discharge pipe 83 is adapted to be emptied at the right-hand side of the `machine (see Fig. 1), a discharge conduit, e. g., a rubber hose 85, being connected with the right-hand end of said pipe through which conduit the liquid may be discharged, e. g. into a sink-,hole in a drain board, whereas a plug 46 or the like is inserted into the left-hand end of the pipe. By interchanging the plug 66 and the hose 45 the machine may be adapted to be emptied at its left-hand side.

The rigid conduits 3|) and 3| are each directly connected with the central inlet -of the corresponding pump/and has the shape of an elbow with a wholly free passage (see Figs. 2 and 5) At its free end the conduit is formed to provide a seat for a flap valve having a spherical `valve body 50 and 5|, respectively. Y Similar valves (not shown) may be provided in the outlet pipes and 4| of the pumps.

The conduits 30 and 3| have an kupper lateral extension 54 and a ilange 55 extending `around the 'upper edge thereof (see Figs. 5 and 7), the openings I9 and 23 at the bottom of the wings of the tanks corresponding in shape to the upper 'opening 56 of the conduits 30 and 3|. The openings |9 and 23 are adapted each to enclose the valve body 50 and 5|, respectively, as well as supporting ange 52 on the wings (see alsok Fig. 2).

As shown in Fig. 4, the spray pipe 33 for washing liquid has the shape of a quadrangle having an obtuse angle, an opposite acute angle and the other angles substantially right, two additional spray pipes 5| extending from a distributing chamber 60 arranged at the obtuse angle of the quadrangle and connected with the sides thereof embracing the acute angle. As shown in the figure which by full and chain-dotted lines illustrates the spray pipe 33 in the two end positions thereof, this shape of the spraying device permits an eiiective spraying of the hole cross sectionof the spraying compartment. Provided at the acute angle of the quadrangle is a reversing nozzle 62 of any known type.

The distributing chamber 69 has a downwardly extending n:tubular piece 63 (see Fig. 3). Screwed into saidrpiece is a sleeve 64 having a spherical surface bearing on a'conical valve seat on a. socket 65 screwed into the pipe 32. The spray pipe 33 is further guided by a. pin 65 secured to and extending downwardly from the wall of the distributingchamber 60 and mounted in a bushing 61 in the pipe 32. On account of the axial pressure arising on operation of the washing pump the bearing surface on the sleeve 68 is pressed against the valve seat on the socket 65 thereby ensuring good tightening. On. the other hand the spherical shape of said bearing surface permits a certain adjustabiltiy of the spray pipe 33 without the tightening effect being reduced.

Provided above the two tanks is a plate 'l forming the bottom of the spraying compartment. Thisy plate engages by an upwardly extending peripheral flange 7| the space between the casing lll and a downwardly extending flange l2 secured thereto (see Fig. 3), thetanks I8 and 20 being secured to said plate, for instance by soldering as shown at 18. The motor pump unit together with the tanks and the plate are kept in position by means of threaded bolts 19 screwedinto ttings 8D secured to the casing 'i8 and guided in guidances 8| fixed to the plate ill or any part connected thereto. Provided in the plate 'iti is an opening 'I3 communicating with the open washing tank I8, and provided below said opening is a removable strainer 14.

According to Figs. 2, 3 and 4 the vpipe 35 for f rinsing liquid as shown in Fig. 1 has the form of a duct E5 xed to the underside of the plate 10.

' The rinsing nozzles 31 are rigidly connected to the plate 1|! andy consist of projections pressed up in said plate at suitable places above the duct l5, said projections having a central conical depression 16 (see especially Fig. 6) and two opposite holes 11 the diameter of which is not essentially smaller than the thickness of the plate 10. On account of this shape of said nozzles the rinsing liquid will be atomized into a iine rain or drizzle causing an eective rinsing of the dishes by means -of a relatively small volume of rinsing liquid.

The operation of the machine is as follows: i Through the charging opening 22 the machine is lled with any suitable liquid, usually warm water. 'Thereby the rinsing tank 20 is iirst filled with liquid, and when said tank is full, the water iiows through the overflow 2l into the washing tank I8 which is iilled up to the overiiow 43.

function whereby the dishes are sprayed from below by a plurality of efllcacious water jets issuing through the holes 34 in the spray pipe 33 which by the reversing nozzle 62 is brought into a reciprocating swinging motion. Washing liquid from the spraying compartment is returned to the washing liquid tank I8, impurities being collected on the strainer 14. Consequently, the dishes will be sprayed repeatedly by one and the same washing liquid. When the washing is considered to be completed, valve 58 is closed, valve 8| opened, and the valve in outlet pipe 4I is closed. Thereby the rinsing pump is set into operation resulting in the dishes being sprayed by pure water from the rinsing tank 20 in the form oi' a iine drizzle. Rinsing liquid is not returned to the rinsing tank but through the strainer I4 to the washing tank I8 which now begins to empty itself 1 through overiiow 43 and discharge pipe 42. Consequently, the rinsing liquid is used only one time which is of advantage for obtaining a hygienic rinsing action. When the rinsing tank is empty,

` the rinsing is completed, whereafter the clean dishes may be removed from the machine.

What I claim is: 1. In' a dish-washing machine, separate tanks for washing liquid and rinsing liquid, the washing tank being open at its top and the rinsing tank i closed at its top, said tanks being situated side by side but superposed in such manner that the bottom .wall of the washing tank forms top wall of the rinsing tank.

2. In a dish-washing machine, a liquid receptacle of substantially parallelepipedic shape and having an upper opening, and a wall in said receptacle inclined to horizontal and extending from an edge of the opening towards the bottom of the receptacle, said wall dividing the receptacle into two separate compartments and extending substantially diagonally of the receptacle and being securely connected with two side walls and the bottom wall thereof,an open compartment for washing vliquid having said wall as bottom wall and a closed compartment i'or rinsing liquid having the wall as top wall.

3. In a dish-washing machine, a liquid receptacle of substantially parallelepipedic shape and having an opening of substantially rectangular Ishape, two walls in said receptacle inclined to horizontal, each wall extending from one of two tacle of substantially parallelepipedic shape and having an upper opening of vsubstantially rectangular shape, a Wallin said receptacle inclined to horizontal and extending from an edge of said opening .towards the bottomV of the receptacle, said wail dividing the receptacle into two separate compartments, each of said walls extending substantially diagonally of the receptacle and being securely connected with two side walls and the bottom wall thereof-an open compartment for washing liquid having said wall as bottom wall and a closed compartment for rinsing liquid having the wall as top wall,an overflow from the rinsing tank to the washing tank and another u overiiow from the washing tank to waste.

5. In a dish-washing machine having in combination two spraying devices, one for washing lliquids comprising a pump, a tank open at its top, a spraying device, and connections between 30 said tank, pump and spraying device, and the other for rinsing liquid rincluding a rinsing tank closed at its top, a rinsing pump, a rinsing spraying device and connections between said rinsing tank, pump and spraying device, Vsaid 35 v tanks being situated substantially side by side but superposed in such a manner that the bottom wall lof the washing tank forms the top wall of the rinsing tank, means to connect the suction yside ot each pump with an opening in the coro responding tank located at a place of the latter where the depth of the liquid is greatest, and a valve in each opening for, controlling theiiow of liquid between its associated tankand pump.

6. A dish-washing machine having in combination a casing, an apertured lpartition in said casing, dividing the same into an upper chamber and a lower chamber, a spraying systeml for washing liquid comprising a pump andan open tank both located in said lower chamber. a spraying device located in said upper chamber, connecting means between vsaid tank, pump and spraying device, a rinsing spraying system for rinsing liquid comprising a rinsing pump and rinsing tank both located in said lower chamber, g5

spraying means'formedin said partition, the washing tank communicating with the aperture in said'partition and having'its `bottom vwall adapted to form the top wall of the rinsing tank,

and connecting means between said rinsing tank, Q0-

pump and spraying means.

'ronnnnrknlminm infima'.Y 

